Turbo-alternator.



PATENTED FEB. 18, 1908.

C. E. LORD. TURBO ALTERNATOR.

APPLICATION FILED JUNE 7.1905.

V/lll Wi In esses W UNITED STATES PATENT OFFICE.

CHARLES E. LORD, OF NORWOOD, OHIO, ASSIGNOR TO THE BULLOCK ELECTRIC MANUFACTURING COMPANY, CORPORATION OF OHIO.

TURBO-ALTERNATOR.

Specification of Letters Patent.

Patented Feb. 18, 1908.

Application filed June 7. 1905- Berial No. 264.159

To all whom it may concern:

Be it known that 1, CHARLES E. Loan, a

citizen of the United States, residing at orwood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Turbo-Alternators, of which the following is a full, clear, and exact specification.

My present invention relates to im rovements in the construction of dynamo-e ectric machines, particularly to the means for ventilating high-speed machines such as turbogenerators.

In the types of dynamo-electric machines most commonly employed at the present time, the rotatable member is provided with axial and radial passageways, and the stationary member is provided with radial assage-ways through its core between its windings, the passage-ways in the stationary windingsbeing in radial alinement with the radial passage-ways of thero'tatable member. When such a machine is in operation, the air enters the rotatable member through said axial passage-ways, thence flows through the radial passage-ways of said member into the air-gap of the machine, from which it flows through the passage-ways of the stationar Y member and out of the machine through openings in the periphery of its frame or yloke. When this construction is applied to 'gh-speed' machines, and particularly to turbo-generators in which the rotatable member has a comparatively small'diameter, it is practically impossible to force enough air radiallyacross the air-gap to ventilate the machine properly.

The object of my invention is to construct and arrange a dynamo-electric machine and the ventilating passageways thereof, so that sufficient air to ventilate all parts may be readily supplied to the machine and the noise due to the flow of air may be reduced to a minimum.

The invention herein illustrated and described is a modification of that covered by my co-pending application Serial No. 264, 158, filed June 7, 1905, and consists of a dynamoelectric machine having a stationary and a rotatable member, and means for ventilating said members com )rising means for supplying a blast of ail-tot e stationary member and means for suppl 'ing an independent blast of air to the rotata le member, the machine be ingpreferably constructed so that the blast of air for the rotatable member does not reenter the machine after passing through the air-ga The invention also consists of more speci c improvements in the construction and arrangement of the machine which will be hereinafter described and more particularly pointed out in the appended claims.

Referring now to the accompanying drawings which illustrate the preferred embodiment of my invention, Figure 1 is alongitudinal section of a dynamo-electric machine constructed in accordance with my invention; and Fig. 2 is a section on theline 2'2 of Fig. 1.

In the drawings the stationary member, or armature is indicated by 5 and has mounted within it the rotatable member or field magnet 6 on the shaft 7. It will of course be understood that the armature may become the rotatable member and the field magnet may become the stationary member without departing from the s irit of the invention.

be stationary [110111)61 comprises the frame 8 in which are formed passage-ways 9 and 10, communicating with the passage-ways 11 formed between the grouped laminations 12 of the core 13. Said core supports in any desired manner the windings 14. The passageways 11 are arranged substantially concentrically about the axis of the rotatable member 6 and are supplied with a blast of air at comparatively low pressure and large volume from a regulable source external to the machine, such as the blower 15 which may be mounted directly u on shaft 7 as shown in Fig. 1, or may be (ffiven entirely independently of the machine. The volume of air is regulated by means such as the valve 20. To confine the blast of air to the stationary member and to )revent same from entering the air-gap 16'of the machine, and also to prevent the air in-said air-gap from flowing between the windings of the stationary member and entering the passage-ways in the latter, I provide the separating strips '17 which may be in the form of parallel strips in the stationary member concentrically arranged about the axis of the rotatable member or may be in the form of plugs between the windings of said stationary member.

To ventilate the rotatable member I sugply an axial blast of air to its periphery. A though any desired means may be emplo ed for this purpose it is preferably accomplis led by the angularly arranged fan-blades 18 mounted upon the ends of the rotatable tween the rotatable iield magnet am member and forcing a blast of air through the I air-gap in a direction substantially parallel to the axis of the rotatable member.

In the operation of the machine the air for cooling the armature or stationary member ilows from the blower. 15 through the ipe 19 into the passage-ways 9 at the peripl iery of the 1 .achine, thence through passage-ways 11 as indicated by the arrows, Fig. 2, concent-rically about the rotatable member, but not in contact therewith, and out at the periphery oi' the machine through passage-ways 10. An independent current of air which does not mingle in any way with said blast through the armature is forced axially over the eri )hery of the rotatable member by the fan lat es 18. The machine is so constructed that this blast of air does not re-enter the machine alter passing through the air-gap.

By the ventilating arrangement just described I reduce the noise which usually accompanies the operation of high-s eed generators, eliminate the objectionab e and unsatisfactory radial movement of the ventilat ing currents of air across the air-gap of the machine, .and obtain an easily regulable blast of air of large volume and relatively low velocity through the parts of the'machine which tend to heat the most rapidly.

In the accompanying claims I aim to cover all modifications of the invention which do not depart from the spirit thereof and do not limit myself tothe specific arrangement herein described and illustrated.

Having thus described my invention, what 1 claim as new and desire to secure by Letters Patent is 1. In a dynamo-electric machine, a rotatable field magnet, a stationary armature having ventilating passage-ways which permit a flow of air from the periphery of the machine through said passageways and out again at the periphery 'of the machine, in combination with means for confining the air to said passage-ways while .fiowing through said stationary armature so as to prevent same from entering the air-ga) bel the armature, means external to the machine for causing a current of air to ilowthrou b said passage-ways, and means carried by t 1e field magnet for forcing an independent current of air through the air-gap.

2. In a dynamo-electric machine, a rotatable member, a stationary member provided with ventilating passa e-ways arranged substantially concentrically about the axis of said rotatable member, means for cutting off direct communication between said passage ways and the air-gap of the machine, means external to the machine for forcing air through said passage-ways, and means for producing an axial ventilation through said air-gaIp.

3. n a dynamo-electric machine, a stator having passageways through the core thereof, a rotor, means for causing a current of air to flow through the stator core passa eways, means for causing a current of air o'flow through the air-gap between the stator and rotor, and means for preventing said current of air from entering the stator after it has passed through the air-gap.

4. A dynamo-electric machine having a rotor, a stator surrounding said rotor and provided with ventilating passageways through its core substantially .concentric with said rotor, said machine being constructed to permit a ventilating blast of air to flow through the air-gap between the rotor and stator without entering the stator core passageways while flowing through the machine, and means for forcing a blast of air throu h the air-gap.

5. n a dynamo-electric machine, a stationary member having passageways formed therethrough, a rotatable member, means for supplying a ventilating blast of air to said rotatable member, means for supplying a ventilating blast of air to the passageways of said stationary member, and means for regulating the relative 'intensitiesof said blasts. I

6. In a dynamo-electric machine, a stationar member having passageways formed theretirough, a rotatable member, means for supplying a ventilating blast of air to said rotatable member, means external to the machine for supplying an independent ventilating blast of air to the passageways of said'stationary member, and means for regulating the relative intensities of said blasts.

In testimony-whereof I aflixmy signature, in the presence of two witnesses.

CHARLES E. LORD. Witnesses: Y

L. LOWENBEBG, FRED J .Kmsnr. 

